Starting on the Center Section July 1st, 2010
The center section is the main bulkhead in the fuselage. The wing main spars attach to to the fuselage here, as well as the seats, control columns, etc.
There are a bunch of little brackets, angles, etc, that need to be drilled and riveted to this bulkhead.
Then there are the two doubler bars for some of the wing spar screws. These have two rivets that just keep them in place. There are no holes for the rivets in the bars, so you have to use the pre-punched holes in the center section as guides. To drill the holes, I put two bolts through the bolt holes, and then clamped the bars to the center section. I then started the hole with a hand-held drill — just enough to know where the hole center should be.
I then took the spacer bar to the drill press to finish drilling the hole. This guarantees the hole will be straight.
And here are the two bars with the rivet holes
Finally, there are two reinforcement angles that need to be drilled to the center section. To drill these, I just drew a line down the centerline of the angle, and lined up the markings with the pre-punched holes on the center section. Note the bolt on the lower right — there is one on each end to hold the bulkhead upright on the table. This will of course come out when I’m done riveting all the ‘accessories’ to it.
